Discuz! X5.0 Local File Inclusion via enable_disable.php Plugin Directory

Discuz! X5.0 releases 20260320 through 20260610 contain a local file inclusion vulnerability that allows authenticated administrators to execute arbitrary code by importing a specially crafted plugin configuration containing path traversal sequences in the directory attribute. Attackers can trigger an exception during plugin installation to bypass sanitization routines, causing malicious paths to be stored unsanitized and subsequently passed to include(), which combined with file upload functionality escalates to arbitrary code execution in the context of the web server user.

Discuz! X5.0 CAPTCHA Bypass via Predictable Character Set

Discuz! X5.0 releases 20260320 through 20260610 contains a CAPTCHA bypass vulnerability that allows unauthenticated remote attackers to defeat challenge controls by exploiting limited complexity and predictable character sets in generated CAPTCHA images. Attackers can train a custom optical character recognition model against collected CAPTCHA samples to reliably predict challenge text, bypassing protections on login, registration, and other functionality from automated abuse.

Discuz! X5.0 Authentication Bypass via dbbak.php Encryption Oracle

Discuz! X5.0 releases 20260320 through 20260501 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to gain unauthorized access to database backup and restore functionality by exploiting a shared cryptographic key between UCenter integration and the database backup API exposed by dbbak.php. Attackers can inject a crafted payload through the username parameter during login to abuse the encryption oracle in logging_ctl::logging_more(), obtain a legitimately signed token, and use it to bypass authorization for database export and import operations, with the additional ability to trigger a race condition to impersonate arbitrary users.

Reflected Cross-Site Scripting (XSS) vulnerability in Discuz! version X3.4 20220811, allows remote attackers to execute arbitrary code and obtain sensitive information via crafted payload to the primarybegin parameter in the misc.php component.

Cross site scripting (XSS) vulnerability in DiscuzX 3.4 allows attackers to execute arbitrary code via the datetline, title, tpp, or username parameters via the audit search.

Discuz! DiscuzX X3.4 allows remote attackers to bypass intended access restrictions via the archiver\index.php action parameter.

Discuz! DiscuzX X3.4 has XSS via the include\spacecp\spacecp_upload.php op parameter.

Discuz! DiscuzX X3.4 has XSS via the include\spacecp\spacecp_space.php appid parameter in a delete action.

Discuz! DiscuzX X3.4 has XSS via the view parameter to include/space/space_poll.php, as demonstrated by a mod=space do=poll request to home.php.

Discuz! DiscuzX X3.4 allows remote authenticated users to bypass intended attachment-deletion restrictions via a modified aid parameter.

Discuz! DiscuzX through X3.4 has reflected XSS via forum.php?mod=post&action=newthread because data/template/1_diy_portal_view.tpl.php does not restrict the content.

Discuz! DiscuzX through X3.4 has stored XSS via the portal.php?mod=portalcp&ac=article URI, related to mishandling of IMG elements associated with remote images.